Yes, you can lock your luggage, but the type of lock matters
You can put locks on most luggage, but TSA-approved locks are the only ones that work for checked bags on U.S. flights. A regular padlock will force TSA agents to cut it open if they need to inspect your bag — and they will inspect it without your permission. TSA-approved locks have a special keyhole that lets agents open them with a master key, then re-lock them without damage.
For carry-on bags, any lock works because TSA does not need to open them during screening — you go through security with your bag. For checked luggage, a TSA lock is the practical choice if you fly domestically. If you fly internationally, check your destination country's rules, because some nations do not allow locked checked bags at all.
Locks do not stop theft in baggage claim or at the airport, but they do prevent casual opening and signal that your bag is secured. A lock is most useful for protecting your bag during ground transport, hotel storage, or hostel stays.
Key Takeaways
- TSA-approved locks are required for checked bags on U.S. flights; regular padlocks will be cut off by security.
- Carry-on bags can use any lock because TSA screens them with you present and does not need to open them.
- Locks prevent casual opening but do not stop determined theft, so keep valuables in your personal item instead.
- International flights may prohibit locked checked bags entirely, so verify your destination's rules before packing.
- TSA locks cost between $5 and $20 and come in combination, key, and cable styles.
TSA locks versus regular locks for checked baggage
A TSA lock has a red diamond symbol on it and a keyhole that matches TSA master keys. When you check a bag with a TSA lock, security can open it without breaking it if they need to inspect the contents. They re-lock it afterward. You keep your own key or combination code and can open it yourself anytime.
A regular padlock, combination lock, or cable lock will be cut off by TSA if agents decide to search your checked bag. You will not be reimbursed for the broken lock. TSA does not announce in advance which bags they will open — it is random and based on screening results. The only way to avoid having a regular lock destroyed is to leave your checked bag unlocked.
TSA locks come in three styles: combination dial, key-operated, and cable. Combination locks are popular because you do not have to carry a key. Key locks are smaller and lighter. Cable locks wrap around the zippers and luggage frame, which is useful if your bag has no locking zippers.
When you can use a regular lock instead
Carry-on bags do not need TSA locks because you take them through security with you. TSA screens carry-on bags while you watch, and they do not open them in a back room. If an agent needs to inspect your carry-on, they will ask you to open it. A regular padlock, combination lock, or cable lock works fine for carry-on because TSA will not cut it.
Regular locks are also fine for luggage that stays in your control — hotel rooms, hostel lockers, car trunks, or storage units. Use them anywhere TSA will not handle your bag. If you are traveling by car, train, or bus within the U.S., regular locks work on checked baggage because TSA does not screen those trips.
International travel and locked baggage rules
Rules for locked checked bags vary by country and airline. Some countries prohibit locked checked luggage entirely because their security protocols require the ability to open any bag at any time. Others allow TSA locks but not regular locks. A few have no restrictions.
Before you pack, check your airline's baggage policy and your destination country's security rules. Call the airline directly or visit their website — policies change and vary by route. If your destination prohibits locked bags, you have two options: travel with an unlocked checked bag, or use a TSA lock and accept that it may be cut if local security needs access.
How to choose the right lock for your luggage
For checked bags on U.S. flights, buy a TSA-approved lock. Look for the red diamond symbol on the packaging. Combination locks eliminate the need to carry a key, which is convenient if you travel often. Key locks are smaller and lighter if you pack light. Cable locks work best if your luggage has soft sides or fabric zippers that a regular padlock cannot grip.
Price ranges from $5 to $20 depending on the brand and style. Cheaper locks ($5 to $10) work fine for occasional travelers. Mid-range locks ($10 to $15) tend to be more durable and have smoother mechanisms. Expensive locks ($15 to $20) often include features like TSA approval plus a cable, or a heavier-duty construction.
For carry-on bags, any lock works, so choose based on what you prefer. A small combination lock is lightweight and does not require a key. A cable lock is flexible and can wrap around multiple zippers or the luggage frame. A padlock is compact and familiar.
What locks do not protect against
A lock prevents someone from opening your bag by hand, but it does not stop a thief who has tools or time. Baggage handlers, airport workers, and other travelers with access to your bag can cut or pry open a lock if they want to. Locks are a deterrent to casual theft and opportunistic opening, not a barrier to determined criminals.
Do not pack valuables like jewelry, electronics, cash, or documents in checked luggage, locked or not. Pack those items in your carry-on bag, which stays with you. Checked bags are handled by many people in many places — a lock makes it harder to open casually, but it does not make the contents safe from theft.
Locks also do not prevent TSA from opening your bag if they decide to search it. That is the entire point of a TSA lock — it lets them open it without breaking it. If you want privacy, a lock does not provide it during the screening process.
Luggage with built-in locks
Many modern luggage pieces come with built-in locks on the zippers. These are usually small key locks or combination locks integrated into the zipper pulls. Built-in locks are convenient because you do not have to buy a separate lock, but they are often weaker than standalone locks and easier to force open.
Check whether your luggage's built-in lock is TSA-approved. Some are, some are not. If it is not TSA-approved and you plan to check the bag on a U.S. flight, you should also carry a TSA lock as a backup. That way, if TSA needs to open your bag, they can use the TSA lock instead of cutting the built-in one.
Frequently Asked Questions
Will TSA cut my lock if I use a regular padlock on a checked bag?
Yes. If TSA decides to inspect your checked bag and it has a regular lock, they will cut it off. You will not be reimbursed. TSA locks are designed so agents can open them with a master key without damaging the lock, which is why they are required for checked bags on U.S. flights.
Can I lock my carry-on bag?
Yes, you can use any type of lock on a carry-on bag because TSA does not open carry-on bags in a back room. You take your carry-on through security with you, and if an agent needs to inspect it, they ask you to open it. A regular padlock, combination lock, or cable lock all work fine.
What if I forget my TSA lock combination?
If you forget the combination to a TSA lock, you will need to cut it off or contact the manufacturer. Some manufacturers can help you reset a lock if you provide proof of purchase, but this varies by brand. Keep your combination written down somewhere safe, or use a key lock instead if you have trouble remembering numbers.
Do I need a TSA lock for international flights?
It depends on your destination. Some countries allow TSA locks, some prohibit all locked checked bags, and some allow only certain types. Check your airline's baggage policy and your destination country's security rules before you pack. When in doubt, contact the airline directly.
Can I use a cable lock on luggage with hard sides?
Yes. A cable lock wraps around the luggage frame and zippers, so it works on both hard-sided and soft-sided bags. Cable locks are flexible and can find multiple zippers at once, which makes them useful if your luggage has several compartments.